Analyses of Reactor Physics Experiments in the Kyoto University Critical Assembly

Shiroya, Seiji; Kanda, Keiji; Tsuchihashi, Keichiro

doi:10.13182/nse88-7

Cited by 22 publications

(4 citation statements)

References 5 publications

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“…For verification of the proposed procedure, numerical verification was carried out for subcriticality monitoring of a water moderated critical assembly installed in the C water tank of Kyoto University Critical Assembly (KUCA) 5) at Kyoto University Research Reactor Institute. The fuel loaded region was assembled to be a rectangular parallelepiped with 35 cm in width (x-direction), 28 cm in depth (y-direction) and 57.05 cm in height (z-direction), as shown in Fig.…”

Section: Specification Of Test Subcritical Systemmentioning

confidence: 99%

“…Numerical analysis was carried out for subcriticality monitoring of a water moderated critical assembly of Kyoto University Critical Assembly(KUCA) 5) at Kyoto University Research Reactor Institute. The objective of this paper is limited to the theoretical presentation of correction procedure and a preliminary verification of feasibility for this rather smallsized neutron multiplying system with a homogeneous reactivity addition.…”

Section: Introductionmentioning

confidence: 99%

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Subcriticality Measurement by Neutron Source Multiplication Method Swith a Fundamental Mode Extraction

Tsuji

Suzuki

Shimazu

2003

J. Nucl. Sci. Technol.

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A new neutron multiplication method has been proposed for an accurate measurement of subcriticality. The proposed method consists of two correction processes for (1) extraction of the fundamental mode from measuring data of a neutron detector that contains higher modes as well as the fundamental mode feeding from an external neutron source and (2) spatial corrections for perturbations induced by a reactivity addition in the distributions of the fundamental mode and a neutron importance field. Feasibility of the proposed method has been verified from a numerical study, although under some limitations such that the neutron multiplying system to be analyzed is small-sized and a reactivity change takes place homogeneously in a fuel loaded region. With extraction of the fundamental mode and the spatial corrections, the subcriticality can be estimated accurately even with measuring data highly contaminated with higher modes due to a detector position near to an external point neutron source. For a future application to measurement of control rod bank worth of a nuclear power plant from measuring data during a reactor physical testing, some useful guidelines have been obtained.

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Section: Specification Of Test Subcritical Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Subcriticality Measurement by Neutron Source Multiplication Method Swith a Fundamental Mode Extraction

Tsuji

Suzuki

Shimazu

2003

J. Nucl. Sci. Technol.

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“…At the Kyoto University Research Reactor Institute (KURRI), a series of preliminary experiments on the ADSR with 14 MeV neutrons was officially launched at Kyoto University Critical Assembly (KUCA) [7][8][9][10][11][12][13][14][15] as a joint-use program among Japanese universities, with prospects of a future plan (Kart & Lab. Project).…”

Section: Introductionmentioning

confidence: 99%

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Pyeon

Hirano

Misawa

et al. 2007

J. Nucl. Sci. Technol.

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A series of preliminary experiments on an accelerator-driven subcritical reactor (ADSR) with 14 MeV neutrons were conducted at Kyoto University Critical Assembly (KUCA) with the prospect of establishing a new neutron source for research. A critical assembly of a solid-moderated and-reflected core was combined with a Cockcroft-Walton-type accelerator. A neutron shield and a beam duct were installed in the reflector region for directing as large a number as possible of the high-energy 14 MeV neutrons generated by deuteron-tritium (D-T) reactions to the fuel region, since the tritium target is located outside the core. And then, neutrons (14 MeV) were injected into a subcritical system through a polyethylene reflector. The objectives of this paper are to investigate the neutron design accuracy of the ADSR with 14 MeV neutrons and to examine experimentally the neutronic properties of the ADSR with 14 MeV neutrons at KUCA. The reaction rate distribution and the neutron spectrum were measured by the foil activation method for investigating the neutronic properties of the ADSR with 14 MeV neutrons. The eigenvalue and fixed-source calculations were executed using a continuous-energy Monte Carlo calculation code MCNP-4C3 with ENDF/B-VI.2 for the subcriticality and the reaction rate distribution, respectively; the unfolding calculation was done using the SAND-II code coupled with JENDL Activation Cross Section File 96 for the neutron spectrum. The values of the calculated subcriticality and the reaction rate distribution were in good agreement with those of the experiments. The results of the experiments and the calculations demonstrated that the installation of the neutron shield and the beam duct was experimentally valid and that the MCNP-4C3 calculations were accurately carried out for analyzing the neutronic properties of the ADSR with 14 MeV neutrons at KUCA.

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“…These experiments allow for precise measurements in well-defined conditions with reactor core under a constant temperature. For light water reactors they are usually performed either to correspond roughly with hot and cold state of power reactor [6] or for temperatures from ambient one to some 80 °C [7,8]. In some cases, cooling system of a research reactor allows for measurement of isothermal temperature reactivity coefficients in a narrow range close to ambient temperature [9].…”

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confidence: 99%

Experimental Instrumentation for Measurement of Reactivity Temperature and Voiding Effects at Zero Power Research Reactors

Bílý¹,

Sklenka²

2013

JEPE

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Analyses of Reactor Physics Experiments in the Kyoto University Critical Assembly

Cited by 22 publications

References 5 publications

Subcriticality Measurement by Neutron Source Multiplication Method Swith a Fundamental Mode Extraction

Subcriticality Measurement by Neutron Source Multiplication Method Swith a Fundamental Mode Extraction

Preliminary Experiments on Accelerator-Driven Subcritical Reactor with Pulsed Neutron Generator in Kyoto University Critical Assembly

Experimental Instrumentation for Measurement of Reactivity Temperature and Voiding Effects at Zero Power Research Reactors

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